JAVA基于JCaptcha生成验证码图片传给前端

package com.valid.main; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.util.HashMap; import java.util.Map; import java.util.Random; import com.octo.captcha.CaptchaFactory; import com.octo.captcha.component.image.backgroundgenerator.UniColorBackgroundGenerator; import com.octo.captcha.component.image.color.RandomRangeColorGenerator; import com.octo.captcha.component.image.fontgenerator.RandomFontGenerator; import com.octo.captcha.component.image.textpaster.DecoratedRandomTextPaster; import com.octo.captcha.component.image.textpaster.RandomTextPaster; import com.octo.captcha.component.image.textpaster.TextPaster; import com.octo.captcha.component.image.textpaster.textdecorator.BaffleTextDecorator; import com.octo.captcha.component.image.textpaster.textdecorator.TextDecorator; import com.octo.captcha.component.image.wordtoimage.ComposedWordToImage; import com.octo.captcha.component.word.FileDictionary; import com.octo.captcha.component.word.wordgenerator.ComposeDictionaryWordGenerator; import com.octo.captcha.component.word.wordgenerator.DummyWordGenerator; import com.octo.captcha.component.word.wordgenerator.WordGenerator; import com.octo.captcha.engine.GenericCaptchaEngine; import com.octo.captcha.image.gimpy.GimpyFactory; import com.octo.captcha.service.image.ImageCaptchaService; import com.octo.captcha.service.multitype.GenericManageableCaptchaService; /** * 验证码管理工具类 * @Author 朱腾 * @Time 2023年7月28日 */ public class ValidCodeUtil { //K：sessionid，V：ImageCaptchaService private static final Map<String, ImageCaptchaService> serviceMap = new HashMap<>(); //验证码服务 public static ImageCaptchaService getService(String sessionid) { //生成新的验证码服务 ImageCaptchaService service = generatorImageService(); serviceMap.put(sessionid, service); return service; } /** * 执行验证码验证 * @Author 朱腾 * @Time 2023年7月29日 */ public static boolean validateCode(String sessionid, String code) { try { ImageCaptchaService service = serviceMap.get(sessionid); return service.validateResponseForID(sessionid, code); } catch (Exception e) { return false; } } /** * 生成随机数图片 * @Author 朱腾 * @Time 2023年7月28日 */ public static GenericManageableCaptchaService generatorImageService() { //文字生成和字数控制相关配置 RandomTextPaster text = null; { int[] R = {0, 120};//参数：RGBA中【R】的取值范围 int[] G = {0, 120};//参数：RGBA中【G】的取值范围 int[] B = {0, 155};//参数：RGBA中【B】的取值范围 //随机颜色初始化配置 RandomRangeColorGenerator colors = new RandomRangeColorGenerator(R, G, B); Integer minLength = 4;//生成文字最低阈值 Integer maxLength = 4;//生成文字最高阈值 Boolean colorManage = true;//是否启用颜色管理，默认不开启区分《每个文字渲染不同的颜色》 text = new RandomTextPaster(minLength, maxLength, colors, colorManage); } //图片尺寸和背景色 UniColorBackgroundGenerator bgColor = null; { Integer width = 200;//幕布宽度：单位是‘像素’ Integer height = 70;//幕布高度：单位是‘像素’ //Color color=Color.LIGHT_GRAY;//图片背景色，可以将注释掉的两个参数追加到下方入参中 RandomRangeColorGenerator randomColor = null;//随机背景色 { int[] R = new int[] {160, 200}; int[] G = new int[] {150, 190}; int[] B = new int[] {220, 255}; randomColor = new RandomRangeColorGenerator(R, G, B);//随机背景色 } bgColor = new UniColorBackgroundGenerator(width, height, randomColor); } //随机生成的字体大小和字体类型，参数1和2表示最小和最大的字体大小，第三个表示随机的字体 RandomFontGenerator fontGen = null; { Integer minSize = 50;//在随机生成文字时，最小文字字体大小 Integer maxSize = 50;//在随机生成文字时，最高文字字体大小 Font[] fs = new Font[] {new Font("Arial", 0, 10), new Font("Tahoma", 0, 10)}; fontGen = new RandomFontGenerator(minSize, maxSize, fs); } //图像构建 ComposedWordToImage image = new ComposedWordToImage(fontGen, bgColor, text); //随机文本初始化 FileDictionary fd = new FileDictionary("toddlist"); //字典文本生成的对象 ComposeDictionaryWordGenerator cdwg = new ComposeDictionaryWordGenerator(fd); GimpyFactory gf = new GimpyFactory(cdwg, image); //创建图片生成引擎 GenericCaptchaEngine gce = new GenericCaptchaEngine(new CaptchaFactory[] {gf}); GenericManageableCaptchaService gmc = null; { Integer expireTime = 180;//失效时长，计算单位：秒 Integer maxStory = 200000;//最大缓存 gmc = new GenericManageableCaptchaService(gce, expireTime, maxStory); } return gmc; } /** * 生成随机数 * @Author 朱腾 * @Time 2023年7月28日 */ private static String generateRadomText() { //生成的文本内容，该内容将显示在验证码图片中 StringBuffer textContent = new StringBuffer(); //中文数字 String[] numC = {"零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"}; //阿拉伯数字 int[] nums = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; //运算字符 String[] signs = {"+", "-", "x"}; String[] signC = {"加", "减", "乘"}; //计算随机数 Random ra = new Random(); int num1 = ra.nextInt(nums.length);//数字“数组”下标：第一个数字 int num2 = ra.nextInt(nums.length);//数字“数组”下标：第二个数字 int signIndex = ra.nextInt(signs.length); String sign = signs[signIndex];//计算公式英文符号 //获取随机的《中文或者英文字符》 String signRd = ""; { //从中文或者英文字符中随机取一个 String[] rSigns = {signs[signIndex], signC[signIndex]}; signRd = rSigns[ra.nextInt(rSigns.length)];//计算符号：随机的，中文或者英文字符 } String no1 = "";//第一个数字 String no2 = "";//第二个数字 { String[] rn1 = {numC[num1], String.valueOf(nums[num1])}; String[] rn2 = {numC[num2], String.valueOf(nums[num2])}; no1 = rn1[ra.nextInt(rn1.length)]; no2 = rn2[ra.nextInt(rn1.length)]; } //初始化公式 textContent.append(no1).append(" ").append(signRd).append(" ").append(no2).append(" = ? "); int result = 0; //计算公式结果 switch (sign) { case "+": { result = nums[num1] + nums[num2]; break; } case "-": { result = nums[num1] - nums[num2]; break; } case "x": { result = nums[num1] * nums[num2]; break; } } System.out.println(textContent.